American Granby FSG-2 Pressure Switch for Water Pumps Brand: American Granby | SKU: FSG-2 Product Overview The American Granby FSG-2 is an electromechanical pressure switch used to start and stop a compatible water pump as pressure changes in a well or water-supply system. The diaphragm responds to system pressure and operates the electrical contacts, allowing the pump to replenish stored water when pressure falls and shut off after the selected upper threshold is reached. This automatic control is central to normal pressure-tank operation. The switch includes an adjustable differential, screw-clamp terminals, a G 1/4 female ISO 228 fluid connection, and a general-purpose NEMA Type 1 enclosure. Because pressure settings and motor ratings must match the installation, confirm the pump voltage, phase, horsepower, wiring, connection, and pressure requirements before replacement. Key Features: Diaphragm-actuated pump control Contacts open on increased pressure Adjustable differential NEMA Type 1 enclosure G 1/4 female ISO 228 fluid connection Screw-clamp terminals Common Uses: Residential well pumps Pressure tank systems Fresh-water and listed sea-water applications Pressure-switch replacement and troubleshooting Technical Specifications: Controlled Fluid Temperature: 32-158°F Line Rated Current: 10A at 250 VAC Approximate Size: 4.02 in. D x 3.78 in. H x 2.83 in. W Connection: G 1/4 female ISO 228 Compatibility and Safety Notes: Electrical selection and installation should be completed by a qualified person. Match the switch to the motor and pressure system before wiring. FAQ: What does the switch control?It starts and stops a compatible pump in response to system pressure. Can it replace any pressure switch?No. The pressure, motor, electrical, connection, and enclosure ratings must match. Why Buy From Big Frog Supply? Big Frog Supply provides clear product information, helpful support, and convenient online ordering for pump-control components.
